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I will suggest that sketches are images, be they by the early pioneers of astronomy or those of today. Each of those early images, if they were widely available at the time, go towards expanding that Knowledge that Alex refers to below. However, it was only with the advent of film and more modern digital camera based images that the perception of detail could be transformed. These images then form the knowledge extension, without camera images we would be limited to sketches made by folks using the best equipment in the best location, capturing real time photons. Coming back to "wishful detail", tonight's observer is armed with a vast extension of his/her visual senses thanks to detailed images. Does this not impact what he/she thinks they see? I believe it does because they know it is there.
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